12 HOURS TO VOTE
Polls will be open from 7:30 a.m. to 7:30 p.m., but if there are lines at any of the state's 2,400-plus precincts at 7:30 p.m., those precincts will remain open until everyone there has had a chance to vote. Counties can start reporting votes when their tallies are ready. They do not have to wait until everyone in the state has voted.
VOTER ID
Tuesday's election will be the first statewide test of Arkansas' new voter ID law. The law requires voters to show photo identification before casting a ballot, and was approved by the Republican-led Legislature last year over Democratic Gov. Mike Beebe's veto. The requirement took effect Jan. 1, and has been used in a handful of local elections so far. A Pulaski County judge has declared the law unconstitutional, but said he wouldn't block its enforcement during the primary.
JOB VACANCIES
Arkansas has two open U.S. House races this year: Tom Cotton, a Republican, has given up his south Arkansas seat to pursue a U.S. Senate post currently held by Mark Pryor, a Democrat. In central Arkansas, Tim Griffin is leaving Congress, and a spot on the powerful Ways and Means Committee, with the hope of becoming lieutenant governor. He has said he wants a job that will let him spend more time with his family. Republicans have contested primaries for both House seats.